The NMEA 0183 specification defines wind speed and angle message MWV:
$WIMWV,<a.a>,<R>,<s.s>,<U>,<S>*<CS><cr><lf>| $WIMWV | Fixed text at the start of the message |
| <a.a> | Wind angle, 0 … 359 degrees |
| <R> | Reference: R = Relative, T = Theoretical |
| <s.s> | Wind speed |
| <U> | Units: K = km/h, M = m/s, N = knots (only m/s is provided) |
| <S> | Status: A = Valid, V = Invalid |
| * | Asterisk, indicating that the next field is the checksum |
| <CS> | Two-character checksum for the message |
The comma (,) is used as a separator between the fields. Here are some examples of MWV messages:
$WIMWV,39,R,1.3,M,A*06
$WIMWV,61,R,1.0,M,A*08
$WIMWV,39,R,0.5,M,A*01
$WIMWV,59,R,1.2,M,A*01| To enable the automatic MWV message output, use the SETMES command. By default, no automatic messages are enabled. |